UCC28070A: K(D) Equations in UCC28070A databook

CHOI SEUNG WON

Expert 1245 points

Part Number: UCC28070A

Hi TI

I wonder how equations 2 and 3 K(D) are derived. I want to know a reference book or data.

thanks for your help.

over 7 years ago

0 John Griffin1 over 7 years ago

TI__Mastermind 34465 points

Hello CHOI SEUNG WON
Please refer to
www.ti.com/.../slua746.pdf
for explanations
The IEEEE documents in the appendix also have detailed explanations of how the equations were derived

Regards
John

0 CHOI SEUNG WON over 7 years ago in reply to John Griffin1

Expert 1245 points

Thanks John 감사합니다!

then I have questions. I don't understand equation 1 , 2 , 3 for interleaved pfc. (I do not understand Equation 1)

I want to know what I misunderstand ( or someone would explain the formula!)

Regards

Choi

0 CHOI SEUNG WON over 7 years ago in reply to John Griffin1

Expert 1245 points

Thanks John 감사합니다!

then I have questions. I don't understand equation 1 , 2 , 3 for interleaved pfc. (I do not understand Equation 1)

I want to know what I misunderstand ( or someone would explain the formula!)

Regards

Choi

0 John Griffin1 over 7 years ago in reply to CHOI SEUNG WON

TI__Mastermind 34465 points

Hi Choi,
This equation shows how the ripple reduction ratio varies with duty cycle.
The ripple reduction ratio is the inductor ripple with interleaving divided by the ripple without interleaving.
The curve shows how interleaving results in a ripple "cancellation" or reduction due to the phase separation of phase A and B.
Regards
John

0 CHOI SEUNG WON over 7 years ago in reply to John Griffin1

Expert 1245 points

Well ... I was wondering how the formula was derived. Could you explain the formula derivation process?

0 John Griffin1 over 7 years ago in reply to CHOI SEUNG WON

TI__Mastermind 34465 points

Hello Choi,
The authors referenced referenced in the appendix of slua746 detail the derivation of these formulae with much greater insight than is possible on this forum. You should be able to get a copy from your university or your tutor.
Regards
John

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UCC28070A: K(D) Equations in UCC28070A databook